CN105282071B - Weighted score Fourier transform domain spread-spectrum signal parallel interference canceller mistake modification method - Google Patents
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Abstract
Weighted score Fourier transform domain spread-spectrum signal parallel interference canceller mistake modification method, is related to wireless communication field.It is to solve the problem of that PIC method used in wireless system receiver end brings error code to spread and have an impact to demodulation other users information.The present invention is to increase multiple symbol energy accumulative elements and a symbol energy decision unit on the basis of realizing that information is decoded using parallel interference canceller, if there is the signal code energy accumulation value after extending all the way is less than average symbol energy accumulating value, so then will the court verdict to first time accordingly corrected, error code diffusion is reduced, to improve the whole error performance of system.The present invention is suitable in the scene for being carried out signal demodulation using parallel interference canceller method to weighted score Fourier transform domain spread-spectrum signal.
Description
Technical field
The present invention relates to wireless communication fields.
Background technique
In the recent period, a kind of mixed carrier (HC) system based on weight score Fourier conversion (WFRFT) is suggested, the system
Single carrier and multicarrier system characteristic can be merged, and has better adaptability (document 1:2010 to time-frequency interference channel
Year June, plum forests, Sha Xuejun, " The Approach to Carrier Scheme Convergence disclosed in Zhang Naitong
Based on 4-Weighted Fractional Fourier Transform》)。
At the same time, CDMA (CDMA) technology is an effective multiple access and Anti-Multipath Interference Technology.Therefore, in order to
Using the advantage of the two, the HC-CDMA system that mixed carrier technology and Code Division Multiple Access are used in combination is suggested (patent
2: Sha Xuejun, Qiu Xin, plum forests, king's Kun, room night outstanding person disclosed in 2011 " a kind of mixed carrier CDMA Transmission system "；Document 3:
Qiu Xin, Sha Xuejun, plum forests " the Hybrid Carrier Spread Spectrum System Based on disclosed in 2012
4-Weighted Fractional Fourier Transform"；Document 4: Qiu Xin, Sha Xuejun, plum forests are disclosed in 2011
"Performance of hybrid carrier DS CDMA communication system")；The system can merge
Single carrier CDMA and CDMA multiple carrier, moreover it is possible to obtain preferable error performance under frequency-selective channel and mono-tone interference channel.However,
Since CDMA is non-orthogonal multiple (NOMA) scheme, multi-access inference (MAI) is inevitably brought.Currently, using parallel dry
Disturb elimination (PIC) method (document 5:Divsalar D, Simon M K, Raphaeli D. " Improved disclosed in 1998
parallel interference cancellation for CDMA"；Patent 6:Divsalar D, Simon M K,
Raphaeli D. " Parallel interference cancellation for CDMA " disclosed in 1997) it eliminates
The multi-access inference of CDMA is frequently used.But the receiving end of HC-CDMA system be using traditional CDMA demodulation method, it is right
It is not considered using PIC come the method for carrying out information demodulation.
Above-mentioned patent 2 and document 3,4 propose the transmission plan for combining HC system with CDMA technology, in frequency-selective channel
Under the conditions of, it can obtain compared with CDMA multiple carrier and the better error performance of single carrier CDMA.But the receiving end of the transmission plan
Traditional CDMA demodulation method is used, PIC method is not used and carrys out demodulating information.
Patent 6 is proposed receiving end in a cdma system and is eliminated using PIC method multi-access inference (MAI), and decoding is improved
Accuracy.
Summary of the invention
The present invention has been that PIC method used in solution wireless system receiver end brings error code to spread, and to demodulating it
The problem of his user information has an impact, to provide a kind of weighted score Fourier transform domain spread-spectrum signal parallel interference canceller
Mistake modification method.
Weighted score Fourier transform domain spread-spectrum signal parallel interference canceller mistake modification method, it is characterized in that:
In transmitting terminal, K base band mapping signal is divided into one group of [b first1,b2,…bK], using same running time-frequency resource into
Row transmission；K is positive integer；
Base band mapping signal is considered as the data on α rank weight fraction Fourier transformation field, to k-th of base band mapping signal
Use length for the sequence c of MkCarry out sequence extension/spread processing；
Wherein ckIndicate spreading code, k indicates the base band mapping signal serial number to be sent, k ∈ [1, K]；M is integer；
The K length after extension is that the discrete data symbol of M obtains after-α rank weight score Fourier conversion
Time-domain signal；
Then transformed data issue after adding cyclic prefix, D/A conversion process；
In receiving end, if watt level when this K extension signal arrival receiving end is identical；
Data symbol after K extension of superposition is received, after A/D conversion, going circulation prefix processing, is connect
Collection of letters sequences y, sequence length M；
Parallel interference canceller mistake modification method is carried out to signal sequences y is received, is realized by following steps:
Matched filtering is carried out using No.1 matched filter group Step 1: signal sequence y will be received, after obtaining K despreading
Parallel baseband mapping signal, then carry out solution constellation mapping judgement, obtain a parallel base band demapping signal [b of K1,
b2…bK]；
Step 2: the base band demapping signal [b obtained to step 11,b2…bK] be reconstructed, obtain K parallel weights
Structure signal [re1,re2....reK]；
Step 3: reconstruction signal [the r obtained to step 2e1,re2....reK] partial summation operation is carried out, obtain the road K simultaneously
Capable partial summation result；
Step 4: the partial summation result phase that the signal sequence y that receiving end receives after delay is obtained with step 3
Subtract, obtains parallel signal sequences group [r1,r2,…,rK]；
And according to formula:
Ei=| | ri||2
Symbol energy is carried out to each signal sequence respectively and accumulates operation, and by result [E1,E2,…,EK] it is stored in symbol
In energy judging module；
Step 5: to energy accumulation result [E obtained in step 4 in energy judging module1,E2,…,EK] compared
Compared with when being not presentWhen, then follow the steps nine；
Exist working asWhen, then the b that constellation mapping is adjudicated is solved in step 1iIt negates, updates bi
Value；
Step 6: court verdict [the b obtained to step 51,b2…bK] signal reconstruction is carried out, obtain new parallel of K
Reconstruction signal sequence [re1,re2....reK]；
Step 7: the new reconstruction signal sequence [r obtained to step 6e1,re2....reK] partial summation operation is carried out,
Obtain the parallel partial summation result in the new road K；
Step 8: the new partial summation knot that signal sequence y and step 7 that receiving end is received after delay are obtained
Fruit is subtracted each other, and new parallel signal sequences group [r is obtained1,r2,…,rK]；
Step 9: by parallel signal sequences group [r1,r2,…,rK] handled using No. two matched filters, obtain K
Then parallel baseband mapping signal after despreading carries out solution constellation mapping judgement, obtains K parallel base band demapping signals
No.1 matched filter group be by a α rank WFRFT module simultaneously and K length for M solution sequence expansion module
It is composed, α is real number.
No. two matched filter groups are the solution sequence expansion module groups for being respectively M with K length by K α rank WFRFT module
Made of conjunction.
In step 2, to the base band demapping signal [b of step 1 acquisition1,b2…bK] be reconstructed be using regeneration reconstruct
Module realize, it is described regeneration reconstructed module be by K length be M sequence extension module respectively with-α rank WFRFT combine and
At.
In step 3 and step 7, the specific method of partial summation is: removing this road signal, other roads K-1 signal is asked
And output.
Bring of the present invention the utility model has the advantages that
(1) diffusion of PIC bring error code is reduced.
(2) error performance of system is improved.
Detailed description of the invention
Fig. 1 be signal serial interference weed out errors modification method and realize structure schematic illustration；
Fig. 2 is the principles of signal processing schematic diagram of No.1 matched filtering group；
Fig. 3 is the principles of signal processing schematic diagram of No. two matched filtering groups；
Fig. 4 is the principles of signal processing schematic diagram for regenerating reconstructed module；
Specific embodiment
Specific embodiment one, weighted score Fourier transform domain spread-spectrum signal parallel interference canceller mistake modification method,
The present invention relates to mathematical tool be weight score Fourier conversion (WFRFT)；
Discrete-time signal X0(n) α rank 4-WFRFT (in the present invention, also referred to as WFRFT):
Y (n)=Fα[X0(n)]=ω0(α)X0(n)+ω1(α)X1(n)+ω2(α)X2(n)+ω3(α)X3(n) (1)
Wherein: [X0(n),X1(n),X2(n),X3It (n)] is X respectively0(n) 0~3 discrete Fourier transform
(Discrete Fourier Transform, DFT), DFT is used to be calculated shown in formula (2).
The weighting coefficient definition used are as follows:
Assuming that 4-WFRFT system is transmitted using block, when Y (n) is discrete after 4-WFRFT of one group of base band mapping signal
Between signal.
In transmitting terminal, K base band mapping signal is divided into one group of [b first1,b2,…bK], using same running time-frequency resource into
Row transmission.Regard base band mapping signal as data on α rank weight fraction Fourier transformation field, to k-th of base band mapping signal
Use length for the sequence c of MkSequence extension/spread processing is carried out, wherein ckIndicate spreading code, k indicates that the base band to be sent is reflected
Penetrate signal serial number, k ∈ [1, K].The K length after extension is the discrete data symbol process-α rank weighted score Fourier of M
Time-domain signal is obtained after leaf transformation.Then transformed data issue after adding the processing such as cyclic prefix, D/A conversion.This
In can to K extension after discrete data handle transmissions respectively, can also by K extend after sequence correspond to position be superimposed it is latter
It rises and carries out processing transmission.
It in receiving end, to demodulate this K base band mapping signal, and assume to control user power ideal, then the K
Watt level when extending signal arrival receiving end is identical.Data symbol after K extension of superposition is received, through A/D
After the processing such as converting, removing cyclic prefix, obtain receiving signal sequence y, sequence length M.Below to the signal parallel of receiving end
It interferes the modification method step that weeds out errors to be introduced, realizes structure as shown in Figure 1:
Step 1: the signal sequence y that receiving end receives is input to matched filter group one, it is defeated by matched filter group one
The parallel baseband mapping signal after K despreading out is input to judging module, then obtains K parallel base band demapping signals
[b1,b2…bK].Wherein, the internal structure block diagram of matched filter group one is as shown in Fig. 2, it is by a α rank WFRFT module
The c for being M with K lengthiSolution sequence expansion module is composed, and wherein i is the symbol serial number to be demodulated, i ∈ [1, K]；α
It is transformation order corresponding with originator WFRFT.Judging module is to realize solution constellation mapping process.
Step 2: to the court verdict [b obtained at this time1,b2…bK] carry out signal reconstruction, [b1,b2…bK] pass through regeneration
Reconfiguration unit obtains K parallel reconstruction signal [re1,re2....reK].Wherein, regeneration reconfiguration unit internal structure block diagram is as schemed
Shown in 4, it is the c for being M by K lengthiSequence extension module and-α rank WFRFT are composed.Wherein i will be demodulated
Symbol serial number, i ∈ [1, K]；α is transformation order corresponding with originator WFRFT.
Step 3: reconstruction signal [the r obtained to step 2e1,re2....reK] partial summation operation is carried out, obtain the road K simultaneously
Capable partial summation result.Partial summation operation method is to remove this road signal, and other roads K-1 signal is summed and is exported.That is portion
The first via output signal for dividing summation is that the 2nd to the road K reconstruction signal sums；I-th tunnel output signal of partial summation be by
1,2nd ..., i-1, i+1 ... the summation of the road K reconstruction signal.
Step 4: by the signal sequence y that the receiving end after delay receives and the partial summation result that step 3 obtains
Subtract each other, obtains parallel signal sequences group [r1,r2,…,rK].And symbol energy accumulation fortune is carried out to signal sequence respectively by formula (4)
It calculates, and by result [E1,E2,…,EK] be stored in symbol energy judging module.
Ei=| | ri||2 (4)
For example, can be obtained as i=1:
E1=| | r1||2 (5)
Step 5: to energy accumulation result [E obtained in step 4 in energy judging module1,E2,…,EK] compared
Compared with when being not presentWhen, then directly carry out step 9；Exist working asWhen, then
Execute " AiNegate ", to the b that judging module solution constellation mapping is adjudicated in step 1iIt negates, i ∈ [1, K].I.e. if
B is sentenced in step 1iFor 1-i, then being negated at this time as bi=-1+i updates biValue.
Step 6: to the court verdict [b obtained at this time1,b2…bK] carry out signal reconstruction, [b1,b2…bK] pass through regeneration
Reconfiguration unit obtains K new parallel reconstruction signal sequence [re1,re2....reK]。
Step 7: the new reconstruction signal sequence [r obtained to step 6e1,re2....reK] partial summation operation is carried out,
Obtain the parallel partial summation result in the new road K.
Step 8: by the signal sequence y that the receiving end after delay receives and the new partial summation that step 7 obtains
As a result subtract each other, obtain new parallel signal sequences group [r1,r2,…,rK]。
Step 9: by parallel signal sequences group [r at this time1,r2,…,rK] by matched filter group two, it is filtered by matching
Parallel baseband mapping signal after the K despreading that wave device group two exports is input to judging module, then obtains K parallel base band
Demapping signalWherein, the internal structure block diagram of matched filter group two is as shown in figure 3, it is by K α
The c that rank WFRFT module and K length are MiSolution sequence expansion module is composed, and wherein i is the symbol sequence to be demodulated
Number, i ∈ [1, K]；α is transformation order corresponding with originator WFRFT.Judging module is to realize solution constellation mapping process.
Abbreviation and Key Term definition in the present invention:
WFRFT:Weighted-type fractional Fourier transform, weight score Fourier conversion；
HC:Hybrid Carrier, mixed carrier；
CDMA:Code Division Multiple Access, CDMA；
PIC:Parallel Interference Canceller/Cancellation, parallel interference canceller；
NOMA:Non-Orthogonal Multiple Access, non-orthogonal multiple；
MAI:Multiple Access Interference, multi-access inference；
The present invention is to propose mistake modification method on the basis of receiving end carries out information demodulation using PIC and realize to tie
Structure improves the reliability and error performance of system to reduce the diffusion of PIC bring error code.
Compared with patent 2 and document 3,4, present invention proposition is mentioned in receiving end using based on the mistake modification method of PIC
The error performance of high Demodulation Systems.
Compared with patent 6, present invention is distinguished in that being used to weighted score Fourier transform domain spread-spectrum signal
When PIC technology demodulates, mistake modification method joined to improve to decode accuracy and reduce error code and spread, final raising system is whole
Body error performance.
Application scenarios of the invention
In mixed carrier system, applies and parallel interference canceller side is being used to weighted score Fourier transform domain spread-spectrum signal
The scene of method progress signal demodulation.
Claims (4)
1. weighted score Fourier transform domain spread-spectrum signal parallel interference canceller mistake modification method, it is characterized in that:
In transmitting terminal, K base band mapping signal is divided into one group of [b first1,b2…bK], it is passed using same running time-frequency resource
It is defeated；K is positive integer；
Base band mapping signal is considered as the data on α rank weight fraction Fourier transformation field, k-th of base band mapping signal is used
Length is the sequence c of MkSpread processing is carried out, α is real number；
Wherein ckIndicate spreading code, k indicates the base band mapping signal serial number to be sent, k ∈ [1, K]；M is integer；
The K length after extension is that the discrete data symbol of M obtains time domain after-α rank weight score Fourier conversion
Signal；
Then transformed data issue after adding cyclic prefix, D/A conversion process；
In receiving end, if watt level when this K extension signal arrival receiving end is identical；
Data symbol after K extension of superposition is received, after A/D conversion, going circulation prefix processing, obtains receiving letter
Number sequences y, sequence length M；
Parallel interference canceller mistake modification method is carried out to signal sequences y is received, is realized by following steps:
Step 1: will receive signal sequence y using No.1 matched filter group carry out matched filtering, obtain K de-spread after and
Then row base band mapping signal carries out solution constellation mapping judgement, obtains K parallel base band demapping signal [b1,b2…bK]；
Step 2: the base band demapping signal [b obtained to step 11,b2…bK] be reconstructed, obtain K parallel reconstruct letters
Number [re1,re2….reK]；
Step 3: reconstruction signal [the r obtained to step 2e1,re2….reK] carry out partial summation operation, it is parallel to obtain the road K
Partial summation result；The specific method of partial summation is: removing this road signal, other roads K-1 signal is summed and is exported；
Step 4: the signal sequence y that receiving end receives after the delay partial summation result obtained with step 3 is subtracted each other, obtain
Obtain parallel signal sequences group [r1,r2,…,rK]；
And according to formula:
Ei=| | ri||2
Symbol energy is carried out to each signal sequence respectively and accumulates operation, and by result [E1,E2,…,EK] it is stored in symbol energy
In judging module；
Step 5: to energy accumulation result [E obtained in step 4 in energy judging module1,E2,…,EK] be compared,
When being not presentWhen, then follow the steps nine；
Exist working asWhen, then the b that adjudicates of constellation mapping will be solved in step 1iValue negates, as new
BiValue；
Step 6: court verdict [the b obtained to step 51,b2…bK] signal reconstruction is carried out, obtain K new parallel reconstruct
Signal sequence [re1,re2….reK]；
Step 7: the new reconstruction signal sequence [r obtained to step 6e1,re2….reK] partial summation operation is carried out, it obtains new
The parallel partial summation result in the road K；
Step 8: the new partial summation result phase that the signal sequence y that receiving end receives after delay is obtained with step 7
Subtract, obtains new parallel signal sequences group [r1,r2,…,rK]；
Step 9: by parallel signal sequences group [r1,r2,…,rK] handled using No. two matched filters, obtain K despreading
Then parallel baseband mapping signal afterwards carries out solution constellation mapping judgement, obtains K parallel base band demapping signals
2. weighted score Fourier transform domain spread-spectrum signal parallel interference canceller mistake amendment side according to claim 1
Method, it is characterised in that No.1 matched filter group is by a α rank weighted score Fourier transformation WFRFT module while and K
Length is what the solution sequence expansion module of M was composed.
3. weighted score Fourier transform domain spread-spectrum signal parallel interference canceller mistake amendment side according to claim 2
Method, it is characterised in that No. two matched filter groups are long with K respectively by K α rank weighted score Fourier transformation WFRFT module
Degree is what the solution sequence expansion module of M was composed.
4. weighted score Fourier transform domain spread-spectrum signal parallel interference canceller mistake amendment side according to claim 3
Method, it is characterised in that in step 2, to the base band demapping signal [b of step 1 acquisition1,b2…bK] to be reconstructed be using again
Raw reconstructed module realization, the regeneration reconstructed module is divided respectively with the weighting of-α rank by the sequence extension module that K length is M
Number Fourier transformation WFRFT is composed.
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| CN108900280B (en) * | 2018-06-22 | 2020-12-11 | 达新宇 | Novel adaptive code modulation method combined with WFRFT (frequency-weighted round robin) preprocessing and wireless communication system |
| CN109981223B (en) * | 2019-04-02 | 2022-06-21 | 中国科学院上海高等研究院 | FRFT-based multi-carrier FTN (fiber to the Home) sending/receiving method and related equipment |
| CN112666436B (en) * | 2020-01-02 | 2022-06-21 | 青岛鼎信通讯股份有限公司 | Electric arc crosstalk signal identification method based on vector analysis and calculation |
| CN118381525B (en) * | 2024-06-25 | 2024-08-20 | 中国人民解放军国防科技大学 | Method and device for jointly suppressing narrowband and multiple access interference |
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